Conferer.Source.Env

Environment based source

Documentation

data EnvSource

Source that interfaces with the environment transforming keys by uppercasing and interspersing underscores, and using a prefix to avoid clashing with system env vars

so with "app" prefix, "some.key" turns into APP_SOME_KEY

Constructors

EnvSource

Fields

• environment :: RawEnvironment
• keyPrefix :: Prefix
• innerSource :: Source

Instances

Show EnvSource

Defined in Conferer.Source.Env

Methods

showsPrec :: Int -> EnvSource -> ShowS

show :: EnvSource -> String

showList :: [EnvSource] -> ShowS

IsSource EnvSource

Defined in Conferer.Source.Env

Methods

getKeyInSource :: EnvSource -> Key -> IO (Maybe Text)

getSubkeysInSource :: EnvSource -> Key -> IO [Key]

type RawEnvironment = [(String, String)]

Type alias for the environment

type Prefix = Text

Type alias for the env vars prefix

fromConfig :: Prefix -> SourceCreator

Create a SourceCreator using fromEnv

fromEnv :: Prefix -> IO Source

Create a Source using the real environment

fromEnvList :: RawEnvironment -> Prefix -> Source

Create a Source using a hardcoded list of env vars

keyToEnvVar :: Prefix -> Key -> Text

Get the env name from a prefix and a key by uppercasing and intercalating underscores

envVarToKey :: Prefix -> Text -> Maybe Key

The opossite of keyToEnvVar